<?php
// +----------------------------------------------------------------------+
// | PHP versions 4 and 5                                                 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2006 Manuel Lemos, Tomas V.V.Cox,                 |
// | Stig. S. Bakken, Lukas Smith                                         |
// | All rights reserved.                                                 |
// +----------------------------------------------------------------------+
// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB  |
// | API as well as database abstraction for PHP applications.            |
// | This LICENSE is in the BSD license style.                            |
// |                                                                      |
// | Redistribution and use in source and binary forms, with or without   |
// | modification, are permitted provided that the following conditions   |
// | are met:                                                             |
// |                                                                      |
// | Redistributions of source code must retain the above copyright       |
// | notice, this list of conditions and the following disclaimer.        |
// |                                                                      |
// | Redistributions in binary form must reproduce the above copyright    |
// | notice, this list of conditions and the following disclaimer in the  |
// | documentation and/or other materials provided with the distribution. |
// |                                                                      |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken,    |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission.                                                  |
// |                                                                      |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT    |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    |
// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE      |
// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,          |
// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
// |  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED  |
// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT          |
// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE          |
// | POSSIBILITY OF SUCH DAMAGE.                                          |
// +----------------------------------------------------------------------+
// | Author: Lukas Smith <smith@pooteeweet.org>                           |
// +----------------------------------------------------------------------+
//
// $Id: mysql.php,v 1.86 2006/09/26 13:57:11 quipo Exp $
//

require_once 'MDB2/Driver/Manager/Common.php';

/**
 * MDB2 MySQL driver for the management modules
 *
 * @package MDB2
 * @category Database
 * @author  Lukas Smith <smith@pooteeweet.org>
 */
class MDB2_Driver_Manager_mysql extends MDB2_Driver_Manager_Common
{

	// }}}
	// {{{ createDatabase()

	/**
	 * create a new database
	 *
	 * @param string $name name of the database that should be created
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function createDatabase($name)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$name = $db->quoteIdentifier($name, true);
		$query = "CREATE DATABASE $name";
		$result = $db->exec($query);
		if (PEAR::isError($result)) {
			return $result;
		}
		return MDB2_OK;
	}

	// }}}
	// {{{ dropDatabase()

	/**
	 * drop an existing database
	 *
	 * @param string $name name of the database that should be dropped
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function dropDatabase($name)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$name = $db->quoteIdentifier($name, true);
		$query = "DROP DATABASE $name";
		$result = $db->exec($query);
		if (PEAR::isError($result)) {
			return $result;
		}
		return MDB2_OK;
	}

	// }}}
	// {{{ createTable()

	/**
	 * create a new table
	 *
	 * @param string $name   Name of the database that should be created
	 * @param array $fields  Associative array that contains the definition of each field of the new table
	 *                       The indexes of the array entries are the names of the fields of the table an
	 *                       the array entry values are associative arrays like those that are meant to be
	 *                       passed with the field definitions to get[Type]Declaration() functions.
	 *                          array(
	 *                              'id' => array(
	 *                                  'type' => 'integer',
	 *                                  'unsigned' => 1
	 *                                  'notnull' => 1
	 *                                  'default' => 0
	 *                              ),
	 *                              'name' => array(
	 *                                  'type' => 'text',
	 *                                  'length' => 12
	 *                              ),
	 *                              'password' => array(
	 *                                  'type' => 'text',
	 *                                  'length' => 12
	 *                              )
	 *                          );
	 * @param array $options  An associative array of table options:
	 *                          array(
	 *                              'comment' => 'Foo',
	 *                              'character_set' => 'utf8',
	 *                              'collate' => 'utf8_unicode_ci',
	 *                              'collate' => 'utf8_unicode_ci',
	 *                              'type'    => 'innodb',
	 *                          );
	 *
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function createTable($name, $fields, $options = array())
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}
		$query = $this->_getCreateTableQuery($name, $fields, $options);
		if (PEAR::isError($query)) {
			return $query;
		}

		$options_strings = array();

		if (!empty($options['comment'])) {
			$options_strings['comment'] = 'COMMENT = '.$db->quote($options['comment'], 'text');
		}

		if (!empty($options['charset'])) {
			$options_strings['charset'] = 'DEFAULT CHARACTER SET '.$options['charset'];
			if (!empty($options['collate'])) {
				$options_strings['charset'].= ' COLLATE '.$options['collate'];
			}
		}

		$type = false;
		if (!empty($options['type'])) {
			$type = $options['type'];
		} elseif ($db->options['default_table_type']) {
			$type = $db->options['default_table_type'];
		}
		if ($type) {
			$options_strings[] = "ENGINE = $type";
		}

		if (!empty($options_strings)) {
			$query.= ' '.implode(' ', $options_strings);
		}
		return $db->exec($query);
	}

	// }}}
	// {{{ alterTable()

	/**
	 * alter an existing table
	 *
	 * @param string $name         name of the table that is intended to be changed.
	 * @param array $changes     associative array that contains the details of each type
	 *                             of change that is intended to be performed. The types of
	 *                             changes that are currently supported are defined as follows:
	 *
	 *                             name
	 *
	 *                                New name for the table.
	 *
	 *                            add
	 *
	 *                                Associative array with the names of fields to be added as
	 *                                 indexes of the array. The value of each entry of the array
	 *                                 should be set to another associative array with the properties
	 *                                 of the fields to be added. The properties of the fields should
	 *                                 be the same as defined by the MDB2 parser.
	 *
	 *
	 *                            remove
	 *
	 *                                Associative array with the names of fields to be removed as indexes
	 *                                 of the array. Currently the values assigned to each entry are ignored.
	 *                                 An empty array should be used for future compatibility.
	 *
	 *                            rename
	 *
	 *                                Associative array with the names of fields to be renamed as indexes
	 *                                 of the array. The value of each entry of the array should be set to
	 *                                 another associative array with the entry named name with the new
	 *                                 field name and the entry named Declaration that is expected to contain
	 *                                 the portion of the field declaration already in DBMS specific SQL code
	 *                                 as it is used in the CREATE TABLE statement.
	 *
	 *                            change
	 *
	 *                                Associative array with the names of the fields to be changed as indexes
	 *                                 of the array. Keep in mind that if it is intended to change either the
	 *                                 name of a field and any other properties, the change array entries
	 *                                 should have the new names of the fields as array indexes.
	 *
	 *                                The value of each entry of the array should be set to another associative
	 *                                 array with the properties of the fields to that are meant to be changed as
	 *                                 array entries. These entries should be assigned to the new values of the
	 *                                 respective properties. The properties of the fields should be the same
	 *                                 as defined by the MDB2 parser.
	 *
	 *                            Example
	 *                                array(
	 *                                    'name' => 'userlist',
	 *                                    'add' => array(
	 *                                        'quota' => array(
	 *                                            'type' => 'integer',
	 *                                            'unsigned' => 1
	 *                                        )
	 *                                    ),
	 *                                    'remove' => array(
	 *                                        'file_limit' => array(),
	 *                                        'time_limit' => array()
	 *                                    ),
	 *                                    'change' => array(
	 *                                        'name' => array(
	 *                                            'length' => '20',
	 *                                            'definition' => array(
	 *                                                'type' => 'text',
	 *                                                'length' => 20,
	 *                                            ),
	 *                                        )
	 *                                    ),
	 *                                    'rename' => array(
	 *                                        'sex' => array(
	 *                                            'name' => 'gender',
	 *                                            'definition' => array(
	 *                                                'type' => 'text',
	 *                                                'length' => 1,
	 *                                                'default' => 'M',
	 *                                            ),
	 *                                        )
	 *                                    )
	 *                                )
	 *
	 * @param boolean $check     indicates whether the function should just check if the DBMS driver
	 *                             can perform the requested table alterations if the value is true or
	 *                             actually perform them otherwise.
	 * @access public
	 *
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 */
	function alterTable($name, $changes, $check)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		foreach ($changes as $change_name => $change) {
			switch ($change_name) {
				case 'add':
				case 'remove':
				case 'change':
				case 'rename':
				case 'name':
					break;
				default:
					return $db->raiseError(MDB2_ERROR_CANNOT_ALTER, null, null,
                    'change type "'.$change_name.'" not yet supported', __FUNCTION__);
			}
		}

		if ($check) {
			return MDB2_OK;
		}

		$query = '';
		if (!empty($changes['name'])) {
			$change_name = $db->quoteIdentifier($changes['name'], true);
			$query .= 'RENAME TO ' . $change_name;
		}

		if (!empty($changes['add']) && is_array($changes['add'])) {
			foreach ($changes['add'] as $field_name => $field) {
				if ($query) {
					$query.= ', ';
				}
				$query.= 'ADD ' . $db->getDeclaration($field['type'], $field_name, $field);
			}
		}

		if (!empty($changes['remove']) && is_array($changes['remove'])) {
			foreach ($changes['remove'] as $field_name => $field) {
				if ($query) {
					$query.= ', ';
				}
				$field_name = $db->quoteIdentifier($field_name, true);
				$query.= 'DROP ' . $field_name;
			}
		}

		$rename = array();
		if (!empty($changes['rename']) && is_array($changes['rename'])) {
			foreach ($changes['rename'] as $field_name => $field) {
				$rename[$field['name']] = $field_name;
			}
		}

		if (!empty($changes['change']) && is_array($changes['change'])) {
			foreach ($changes['change'] as $field_name => $field) {
				if ($query) {
					$query.= ', ';
				}
				if (isset($rename[$field_name])) {
					$old_field_name = $rename[$field_name];
					unset($rename[$field_name]);
				} else {
					$old_field_name = $field_name;
				}
				$old_field_name = $db->quoteIdentifier($old_field_name, true);
				$query.= "CHANGE $old_field_name " . $db->getDeclaration($field['definition']['type'], $field_name, $field['definition']);
			}
		}

		if (!empty($rename) && is_array($rename)) {
			foreach ($rename as $rename_name => $renamed_field) {
				if ($query) {
					$query.= ', ';
				}
				$field = $changes['rename'][$renamed_field];
				$renamed_field = $db->quoteIdentifier($renamed_field, true);
				$query.= 'CHANGE ' . $renamed_field . ' ' . $db->getDeclaration($field['definition']['type'], $field['name'], $field['definition']);
			}
		}

		if (!$query) {
			return MDB2_OK;
		}

		$name = $db->quoteIdentifier($name, true);
		return $db->exec("ALTER TABLE $name $query");
	}

	// }}}
	// {{{ listDatabases()

	/**
	 * list all databases
	 *
	 * @return mixed data array on success, a MDB2 error on failure
	 * @access public
	 */
	function listDatabases()
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$result = $db->queryCol('SHOW DATABASES');
		if (PEAR::isError($result)) {
			return $result;
		}
		if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
		}
		return $result;
	}

	// }}}
	// {{{ listUsers()

	/**
	 * list all users
	 *
	 * @return mixed data array on success, a MDB2 error on failure
	 * @access public
	 */
	function listUsers()
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		return $db->queryCol('SELECT DISTINCT USER FROM USER');
	}

	// }}}
	// {{{ listTables()

	/**
	 * list all tables in the current database
	 *
	 * @param string database, the current is default
	 * @return mixed data array on success, a MDB2 error on failure
	 * @access public
	 */
	function listTables($database = null)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$query = "SHOW /*!50002 FULL*/ TABLES";
		if (!is_null($database)) {
			$query .= " FROM $database";
		}
		$query.= "/*!50002  WHERE Table_type = 'BASE TABLE'*/";

		$table_names = $db->queryAll($query, null, MDB2_FETCHMODE_ORDERED);
		if (PEAR::isError($table_names)) {
			return $table_names;
		}

		$result = array();
		foreach ($table_names as $table) {
			if (!$this->_fixSequenceName($table[0], true)) {
				$result[] = $table[0];
			}
		}
		if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
		}
		return $result;
	}

	// }}}
	// {{{ listViews()

	/**
	 * list the views in the database
	 *
	 * @param string database, the current is default
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 **/
	function listViews($database = null)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$query = 'SHOW FULL TABLES';
		if (!is_null($database)) {
			$query.= " FROM $database";
		}
		$query.= " WHERE Table_type = 'VIEW'";

		$result = $db->queryCol($query);
		if (PEAR::isError($result)) {
			return $result;
		}

		if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
		}
		return $result;
	}

	// }}}
	// {{{ listTableFields()

	/**
	 * list all fields in a tables in the current database
	 *
	 * @param string $table name of table that should be used in method
	 * @return mixed data array on success, a MDB2 error on failure
	 * @access public
	 */
	function listTableFields($table)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$table = $db->quoteIdentifier($table, true);
		$result = $db->queryCol("SHOW COLUMNS FROM $table");
		if (PEAR::isError($result)) {
			return $result;
		}
		if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
		}
		return $result;
	}

	// }}}
	// {{{ createIndex()

	/**
	 * Get the stucture of a field into an array
	 *
	 * @author Leoncx
	 * @param string    $table         name of the table on which the index is to be created
	 * @param string    $name         name of the index to be created
	 * @param array     $definition        associative array that defines properties of the index to be created.
	 *                                 Currently, only one property named FIELDS is supported. This property
	 *                                 is also an associative with the names of the index fields as array
	 *                                 indexes. Each entry of this array is set to another type of associative
	 *                                 array that specifies properties of the index that are specific to
	 *                                 each field.
	 *
	 *                                Currently, only the sorting property is supported. It should be used
	 *                                 to define the sorting direction of the index. It may be set to either
	 *                                 ascending or descending.
	 *
	 *                                Not all DBMS support index sorting direction configuration. The DBMS
	 *                                 drivers of those that do not support it ignore this property. Use the
	 *                                 function supports() to determine whether the DBMS driver can manage indexes.
	 *
	 *                                 Example
	 *                                    array(
	 *                                        'fields' => array(
	 *                                            'user_name' => array(
	 *                                                'sorting' => 'ascending'
	 *                                                'length' => 10
	 *                                            ),
	 *                                            'last_login' => array()
	 *                                        )
	 *                                    )
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function createIndex($table, $name, $definition)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$table = $db->quoteIdentifier($table, true);
		$name = $db->quoteIdentifier($db->getIndexName($name), true);
		$query = "CREATE INDEX $name ON $table";
		$fields = array();
		foreach ($definition['fields'] as $field => $fieldinfo) {
			if (!empty($fieldinfo['length'])) {
				$fields[] = $db->quoteIdentifier($field, true) . '(' . $fieldinfo['length'] . ')';
			} else {
				$fields[] = $db->quoteIdentifier($field, true);
			}
		}
		$query .= ' ('. implode(', ', $fields) . ')';
		return $db->exec($query);
	}

	// }}}
	// {{{ dropIndex()

	/**
	 * drop existing index
	 *
	 * @param string    $table         name of table that should be used in method
	 * @param string    $name         name of the index to be dropped
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function dropIndex($table, $name)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$table = $db->quoteIdentifier($table, true);
		$name = $db->quoteIdentifier($db->getIndexName($name), true);
		return $db->exec("DROP INDEX $name ON $table");
	}

	// }}}
	// {{{ listTableIndexes()

	/**
	 * list all indexes in a table
	 *
	 * @param string    $table      name of table that should be used in method
	 * @return mixed data array on success, a MDB2 error on failure
	 * @access public
	 */
	function listTableIndexes($table)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$key_name = 'Key_name';
		$non_unique = 'Non_unique';
		if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			if ($db->options['field_case'] == CASE_LOWER) {
				$key_name = strtolower($key_name);
				$non_unique = strtolower($non_unique);
			} else {
				$key_name = strtoupper($key_name);
				$non_unique = strtoupper($non_unique);
			}
		}

		$table = $db->quoteIdentifier($table, true);
		$query = "SHOW INDEX FROM $table";
		$indexes = $db->queryAll($query, null, MDB2_FETCHMODE_ASSOC);
		if (PEAR::isError($indexes)) {
			return $indexes;
		}

		$result = array();
		foreach ($indexes as $index_data) {
			if ($index_data[$non_unique] && ($index = $this->_fixIndexName($index_data[$key_name]))) {
				$result[$index] = true;
			}
		}

		if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_change_key_case($result, $db->options['field_case']);
		}
		return array_keys($result);
	}

	// }}}
	// {{{ createConstraint()

	/**
	 * create a constraint on a table
	 *
	 * @param string    $table         name of the table on which the constraint is to be created
	 * @param string    $name         name of the constraint to be created
	 * @param array     $definition        associative array that defines properties of the constraint to be created.
	 *                                 Currently, only one property named FIELDS is supported. This property
	 *                                 is also an associative with the names of the constraint fields as array
	 *                                 constraints. Each entry of this array is set to another type of associative
	 *                                 array that specifies properties of the constraint that are specific to
	 *                                 each field.
	 *
	 *                                 Example
	 *                                    array(
	 *                                        'fields' => array(
	 *                                            'user_name' => array(),
	 *                                            'last_login' => array()
	 *                                        )
	 *                                    )
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function createConstraint($table, $name, $definition)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$type = '';
		$name = $db->quoteIdentifier($db->getIndexName($name), true);
		if (!empty($definition['primary'])) {
			$type = 'PRIMARY';
			$name = 'KEY';
		} elseif (!empty($definition['unique'])) {
			$type = 'UNIQUE';
		}

		$table = $db->quoteIdentifier($table, true);
		$query = "ALTER TABLE $table ADD $type $name";
		$fields = array();
		foreach (array_keys($definition['fields']) as $field) {
			$fields[] = $db->quoteIdentifier($field, true);
		}
		$query .= ' ('. implode(', ', $fields) . ')';
		return $db->exec($query);
	}

	// }}}
	// {{{ dropConstraint()

	/**
	 * drop existing constraint
	 *
	 * @param string    $table        name of table that should be used in method
	 * @param string    $name         name of the constraint to be dropped
	 * @param string    $primary      hint if the constraint is primary
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function dropConstraint($table, $name, $primary = false)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$table = $db->quoteIdentifier($table, true);
		if ($primary || strtolower($name) == 'primary') {
			$query = "ALTER TABLE $table DROP PRIMARY KEY";
		} else {
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			$query = "ALTER TABLE $table DROP INDEX $name";
		}
		return $db->exec($query);
	}

	// }}}
	// {{{ listTableConstraints()

	/**
	 * list all constraints in a table
	 *
	 * @param string    $table      name of table that should be used in method
	 * @return mixed data array on success, a MDB2 error on failure
	 * @access public
	 */
	function listTableConstraints($table)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$key_name = 'Key_name';
		$non_unique = 'Non_unique';
		if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			if ($db->options['field_case'] == CASE_LOWER) {
				$key_name = strtolower($key_name);
				$non_unique = strtolower($non_unique);
			} else {
				$key_name = strtoupper($key_name);
				$non_unique = strtoupper($non_unique);
			}
		}

		$table = $db->quoteIdentifier($table, true);
		$query = "SHOW INDEX FROM $table";
		$indexes = $db->queryAll($query, null, MDB2_FETCHMODE_ASSOC);
		if (PEAR::isError($indexes)) {
			return $indexes;
		}

		$result = array();
		foreach ($indexes as $index_data) {
			if (!$index_data[$non_unique]) {
				if ($index_data[$key_name] !== 'PRIMARY') {
					$index = $this->_fixIndexName($index_data[$key_name]);
				} else {
					$index = 'PRIMARY';
				}
				if (!empty($index)) {
					$result[$index] = true;
				}
			}
		}

		if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_change_key_case($result, $db->options['field_case']);
		}
		return array_keys($result);
	}

	// }}}
	// {{{ createSequence()

	/**
	 * create sequence
	 *
	 * @param string    $seq_name     name of the sequence to be created
	 * @param string    $start         start value of the sequence; default is 1
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function createSequence($seq_name, $start = 1)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$sequence_name = $db->quoteIdentifier($db->getSequenceName($seq_name), true);
		$seqcol_name = $db->quoteIdentifier($db->options['seqcol_name'], true);

		$query = "CREATE TABLE $sequence_name ($seqcol_name INT NOT NULL AUTO_INCREMENT, PRIMARY KEY ($seqcol_name))";
		$query.= strlen($db->options['default_table_type']) ? ' TYPE='.$db->options['default_table_type'] : '';
		$res = $db->exec($query);

		if (PEAR::isError($res)) {
			return $res;
		}

		if ($start == 1) {
			return MDB2_OK;
		}

		$query = "INSERT INTO $sequence_name ($seqcol_name) VALUES (".($start-1).')';
		$res = $db->exec($query);
		if (!PEAR::isError($res)) {
			return MDB2_OK;
		}

		// Handle error
		$result = $db->exec("DROP TABLE $sequence_name");
		if (PEAR::isError($result)) {
			return $db->raiseError($result, null, null,
                'could not drop inconsistent sequence table', __FUNCTION__);
		}

		return $db->raiseError($res, null, null,
            'could not create sequence table', __FUNCTION__);
	}

	// }}}
	// {{{ dropSequence()

	/**
	 * drop existing sequence
	 *
	 * @param string    $seq_name     name of the sequence to be dropped
	 * @return mixed MDB2_OK on success, a MDB2 error on failure
	 * @access public
	 */
	function dropSequence($seq_name)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$sequence_name = $db->quoteIdentifier($db->getSequenceName($seq_name), true);
		return $db->exec("DROP TABLE $sequence_name");
	}

	// }}}
	// {{{ listSequences()

	/**
	 * list all sequences in the current database
	 *
	 * @param string database, the current is default
	 * @return mixed data array on success, a MDB2 error on failure
	 * @access public
	 */
	function listSequences($database = null)
	{
		$db =& $this->getDBInstance();
		if (PEAR::isError($db)) {
			return $db;
		}

		$query = "SHOW TABLES";
		if (!is_null($database)) {
			$query .= " FROM $database";
		}
		$table_names = $db->queryCol($query);
		if (PEAR::isError($table_names)) {
			return $table_names;
		}

		$result = array();
		foreach ($table_names as $table_name) {
			if ($sqn = $this->_fixSequenceName($table_name, true)) {
				$result[] = $sqn;
			}
		}
		if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
		}
		return $result;
	}

	// }}}
}
?>
